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| Titel |
Denitrification in sediments as a major nitrogen sink in the Baltic Sea: an extrapolation using sediment characteristics |
| VerfasserIn |
B. Deutsch, S. Förster, M. Wilhelm, J. W. Dippner, M. Voss |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 7, no. 10 ; Nr. 7, no. 10 (2010-10-21), S.3259-3271 |
| Datensatznummer |
250005022
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| Publikation (Nr.) |
 copernicus.org/bg-7-3259-2010.pdf |
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| Zusammenfassung |
| Rates of denitrification in sediments were measured with the isotope pairing
technique at different sites in the southern and central Baltic Sea. The
rates varied between 0.5 μmol N m−2 h−1 in sands and
28.7 μmol N m−2 h−1 in muddy sediments and showed a good correlation to the
organic carbon contents of the surface sediments. N-removal rates via
sedimentary denitrification were estimated for the entire Baltic Sea
calculating sediment specific denitrification rates and interpolating them
to the whole Baltic Sea area. Another approach was carried out by using the
relationship between the organic carbon content and the rate of
denitrification. The N-removal by denitrification in sediments varied
between 426–652 kt N a−1, which is around 48–73% of the external
N inputs delivered via rivers, coastal point sources, and atmospheric
deposition. Moreover, an expansion of the anoxic bottom areas was considered
under the assumption of a rising oxycline from 100 to 80 m water depth. This
leads to an increase of the area with anoxic conditions and an overall
decrease in sedimentary denitrification by 14%. Overall, we show here
that this type of data extrapolation is a powerful tool to estimate the
nitrogen losses for a whole coastal sea and may be applicable to other
coastal regions and enclosed seas. |
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